The Austro-Hungarian Navy was the naval force of Austria-Hungary. Its official name in German was kaiserliche und königliche Kriegsmarine (Imperial and Royal War Navy), abbreviated as k.u.k. Kriegsmarine, and in Hungarian Császári és Királyi Haditengerészet, abbreviated as Cs. és Kir. Haditengerészet.

This navy existed under this name after the formation of the Dual Monarchy in 1867 and continued in service until the end of the First World War in 1918. Prior to 1867, the empire's naval forces were those of the Austrian Empire. By 1915 a total of 33,735 naval personnel were serving in the k.u.k. Kriegsmarine.

After the First World War, both Austria and Hungary were deprived of their coasts, and their navy was confiscated by the victorious Allied powers. Their former ports on the Adriatic Sea, such as Trieste, Pola, Fiume, and Ragusa, became parts of Italy and Yugoslavia. (After the break-up of Yugoslavia, its former coast is divided between Slovenia, Croatia, Bosnia, and Montenegro.)

Ships of the k.u.k. Kriegsmarine were designated SMS, for Seiner Majestät Schiff (His Majesty's Ship).

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